New manager caused Firefox to lose its original profile

[浪迹天涯小叮当]

I created a new profile using the new profile manager released in 138.0, then opened the about:profiles page to see all profiles, but only saw the one I just created (and not the one I was using earlier). I tried to delete it (the newly created one) via the new profile manager, but nothing happened when I pressed the delete button. I tried deleting it again via about:profiles, and this time it worked, however the about:profiles interface showed no profiles at all (even though the one I used earlier was still on my hard drive and still in use in my current Firefox window). I then tried restarting Firefox and the crash report window then appeared. I tried to manually start Firefox again, and it started successfully, but it asked me to create a new profile because it didn't find any existing profile. The old profile I was using has been on my hard drive since the beginning.

I managed to solve this problem by reusing the old profile's directory to create a "new" profile after these happened, and it worked. Firefox seems to have recognized the old one.

[浪迹天涯小叮当]

Just found that even clicking the Default Profile (初始配置文件) won't work at Firefox startup. It just doesn't react to my operation.

[SidSnot]

I absolutely loathe Profiles. A new profile opened up when I booted Firefox and I was completely lost. Where were my bookmarks? Where was anything? It got me very upset, and can see no use for them. I wish I could remove the Profiles tab from the top of the browser. Totally useless and annoying.

[weiqi_chen]

I have the same issue!!

I can't go back to my "Original profile", and Can't delete new profile I just created.

the Delete button on "Delete Profile 1 profile? " confirm window is not working.

[weiqi_chen]

I used to use ”firefox -P“ to switch profiles. When I saw this 'new feature' offered similar functionality, I decided to give it a try. But now I deeply regret doing so—it's terrible!

[SpringCatalogue]

it can be restored. for some reason firefox bugs the profiles.ini with the new semi-profile and you need to find out the path of your former profile. it's still there in the OS's profiles folder. profiles in Windows are stored in 

%appdata%\mozilla\firefox\profiles

then you need to create a new path in profiles.ini pointing to the old profile. (use the already established paths in profiles.ini as guideline or google how to edit profiles.ini)